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Selena Gomez Marks 21st Birthday with Festive Video

Mindy Best/Getty Images for SXSW(LOS ANGELES) -- Selena Gomez officially turns 21 Monday, and she's marking this huge milestone with a festive video for her fans.

In the clip, Selena and her pals are shown partying in a club -- or perhaps it's somebody's basement -- along with a deejay and a bunch of naked mannequins.  Clad in a black midriff-bearing top and short plaid skirt, Selena looks like she's having a blast getting down to the song "Birthday," from her new album Stars Dance.  At the end, the music stops and all her friends sit on the floor and sing "Happy Birthday" to her.

Selena wrote in the video comments field, "I wanted to celebrate my 21st Birthday with all of you, so we made this video for us all to celebrate to. Thank You for all the love and support you have shown and continue to show me. I love you all so much!!...Thanks to all my fans for being so amazing and making me want to make this video for you."

On Facebook, Selena revealed that her birthday "cake" was actually "Jack in the Box tacos," adding, "Yes!"

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